/Engine/Plugins/MovieScene/MovieRenderPipeline/Source/MovieRenderPipelineCore/Public/MoviePipelineSetting.h
When rendering in a new process some settings may need to provide command line arguments to affect engine settings that need to be set before most of the engine boots up. This function allows a setting to provide these when the user wants to run in a separate process. This won't be used when running in the current process because it is too late to modify the command line.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Movie Render Pipeline") void BuildNewProcessCommandLine ( [FString](API\Runtime\Core\Containers\FString) & InOutUnrealURLParams, [FString](API\Runtime\Core\Containers\FString) & InOutCommandLineArgs ) const